NAME
        CreateArgstring - Create an argument string structure

    SYNOPSIS
        argstr = CreateArgstring(string, length)
        D0,A0                    A0      D0

        ubyte *createargstring(ubyte *, ulong);

    FUNCTION
        Allocates a rexxarg structure and copies the supplied string into it.
        The returned pointer points at the string part of the structure
        and can be treated like an ordinary string pointer.  (However, care
        must be taken that you do not change the string)

    INPUTS
        string - A pointer at your input string
        length - The number of bytes of your input string you wish copied.
                 (NOTE:  You are limited to 65,535 byte strings)

    RESULTS
        argstr - A pointer to the argument string.  The results are returned
                 in both A0 and D0.  You should always check the result
                 as an allocation failure would cause an error.

    SEE ALSO
        deleteargstring(), lengthargstring(), clearrexxmsg(), fillrexxmsg()

    BUGS